> minor nitpick, but for the most part (not including the website code, etc), this is not "their data". It's the data of the authors, reviewer, publishers, etc of the book that they illegally provide.

Both are correct. You can say the data belongs to the work of the author. But in context, it's trained on data that exists within the training corpus because in large part of the work and/or resources of anna's archive.

> But let's not forget that if author cannot live of what they create, they, for the most part, won't be able to continue creating.

This is a separate and distinct argument for copyright, I don't find the argument that piracy meaningfully hurts artists compelling. In the context of meaningful harm, I believe it only hurts producers or publishers, almost never the creators directly.